Bryopsis pennata

Thallus filamentous, soft, bushy, in loose feathery clumps or turf-like mats, 1-3(-10) cm high, green, dark green, often with light blue iridescence, sparingly branched. Main axes, 200-360(-450) mm diam., bearing branches and branchlets (pinnulae). Pinnulae linearlanceolate or oblong, (40)-45-110(-150) mm diam., of almost the same length from 600 to 800 mm., constricted at the base, branching in one plane, on opposite sides of branches (distichous) or on one side of branches (unilateral) in a single or double rows in the upper half of the branches. Lower parts of the branches are naked. Rhizoids fibrous, interwoven. Growing on lower intertidal, upper subtidal (to 20 m deep) carbonate rocks, on dead coral fragments, on shaded sides of rocks, in crevices, or epiphytic on large seaweeds, in moderately exposed to wave action shores.

In tropical and subtropical seas of Atlantic, Indian and Pacific Oceans.